Jobation



April 7, 1931.

E. G. DE CORIOLIS BAKE OVEN Filed July 2, 1928 INVENTOR 6 M M m BY L/ATTORNEY 1 N at 2(). 'and"*forms a compartment which 1s Patented Apr. 7,1931 UNITED STATES PATENT OFFICE "ERNEST G. DE CORIOLIS, F TOLEDO, OHIO,ASSIGNOB TO SURFACE COMBUSTION COB- PORATION, OF TOLEDO, OHIO, ACORPORATION 01' NEW YORK BAKE OVEN Application filed July 2, 1928.Serial 1T0. 289,718.

This invention relates to improvements in .as. a whole ovens and heatingapparatus therefor and more particularly to ovens as used by bakers. Itis an object of the invention to provide a an oven construction and aheating system therefor which shall permit indirect uniform heatingthroughout all parts of the oven by products of combustion generated bygas burning means arranged beneath the oven. Another object is to soconstruct the heating apparatus that spent heating gases may be returnedfor circulation with fresh combustion products for the purpose oftempering the freshly generated combustion products. Other objects willmore fully appear hereinafter. I I

Referring to the drawings Fig. 1 is a longitudinal vertical sectionthrough the preferred oven construction, the insulating material withwhich the oven will be surrounded being omitted for simplicity ofshowing, the view being taken on line 11 of Fig. 2;

Fig. 2 is a transverse vertical section of the oven construction shownin Fig. 1;

3 is an enlarged fragmentary section taken on line 33 of Fig. 1; and

Fig. 4 is an enlarged fragmentary section taken on line 44 of Fig. 2. p

The framework for supporting the oven may be of any suitableconstruction. As shown it consists of four corner posts 10, connectedtogether by transversely extending irons 12. 13, 14, 16 and 17.

Supported on the frame work is a double walled oven, the-outer wallthereof beingf generally indicated at 18 and the inner wall at 19." Theoven is relatively shallowas compared. with its width and is relativelylong. The oven. chamber proper is indicated closed at one end 22 andopen at its other end 24 for the reception of material to be baked.

openend of the oven during the baking op- Herationsl Extending forwardlyfrom the open end of the oven is an entry-way 28, this way extendingthrough or bein formed in a body of insulating material not shown) whichencompass the oven constructionto prevent undesirable loss of heat. I IThe space 30 between the inner and outer walls 18 and 19 is divided by aplurality of transversely extending walls 32 into a series ofperipherally extending compartments which constitute flow paths or zonesfor the heating gases. 'For constructional purposes these walls take theform of ribs which are U-shaped incross section, and which have lat eralflanges 34 as more clearly shown in Fig. 4.- The outer shellor casing,whose walls are indicated at 18 is made in sections, the adjacentsections being secured to the side flanges 34 of the U-shaped ribs. Theoven proper, whose walls are indicated at 19, may also be made insections in which event the sections are of a length to extend betweenthe ribs 32 for securement thereto as indicated in Fig. 4. By followingthis construction, the oven proper and the surrounding casing can beformed of convenient size lates. For constructional purposes the rig tand left hand sides of the oven and its surrounding shell are made insections and the oven walls 19 secured at their adjacent ends to u perand lower lon 'tudinall extendin 1rons 36 which are '-shaped 1n crosssection, the legs of the U being rovided-with lateral flanges to whichthe adjacent edges of the wall 19 are secured as clearly indicated inFig. 2.

It will be noted thatthe upper and lower walls 18 of the surroundingcasing are not transversely continuous but terminate some distancelaterally of the longitudinally extendin irons 36. Extending downwardlyfrom the terminal edges of the'lower walls of the casing are plates 38,the bottom edges of these plates being maintained in spaced relation bya plate-4Q (see Fig. 3) suitably secured thereto. Within the chamberformed by the walls 38 are side plates 42 bent into such form as toresemblea hopper. Extendstruts preferably taking the form of longitudinally extending plates. Extending upwardly and inwardly from thelower edges of the side plates 38 are plates 48, the upper ends thereofterminating within and in spaced relation with respect to the side wallsof the restricted portion or throat 46 formed by the walls 42. A rod 50may be passed through the lower ends of plates 42 and 44 and the upperends of plates 48 to give rigidity to the structure.

Suitably supported as on blocks 54 support ed on the plate 40 at thebottom of the side plates 38 is a fuel supply manifold 56 from the topof which extends a series of gas burners 58 of any suitableconstruction. One end of the supply conduit 56 is closed and the otherend is connected with a suitable airgas mixing tube 60, the gas supplypipe leading thereto being indicated at 61.

The gas burners 58 discharge into the throat 46and the hot gasestherefrom flow upwardly, along with spent heating gases flowing from theside conduits 52 formed by the plates 38, 44 and 48, said spent gasesbeing delivered to the conduits 52 in a manner presently explained. Thespent gases temper the fresh hot gases and the tempered mixture flowsinto the flow channels 30 between the outer casing walls 18 and the ovenwalls 19, some of the gases flowing to the left and some to the rightand finally finding their way around the oven for passage into a commoncollecting flue generally indicated at 62. The bottom plate 40 isprovided with a plurality of openings 63 through which secondary air forthe burners may enter.

The common spent gas collecting flue 62 consists of upright walls 64which at their lower ends are secured to the adjacent terminal edges ofthe casing walls 18. The side walls 64 are held in spaced relation by aplate 66 extending therebetween, this plate being 'provided with aplurality of openings 67 for the free passage from below of the spentheating gases. Closing the top of the conduit 62 is a plate 68. Thecollecting flue is in effect an inverted U-shape conduit. -Within theconduit formed by the side walls 64 is provided a series of dampers 70,these damp. ers being of a length to extend between adjacent partitions32 to control the effective size of the exit from the flow passages 30surrounding the oven proper. The dampers are individually adjusted byraising and lowering the rods 72 to which the lower ends of which thedampers are secured. By adjusting the individual dampers it is obviousthat the volume of heating gases which may flow through any given flowpassages 30 due to the suction of a fan 78 can be regulated as desiredand consequently localization of heat in any particular part of the ovencan be readily obtained.

One end of the common collecting flue 62 is suitably closed as indicatedat 74 and the other end connects with an outlet passage 76 which in turnconnects with said suction fan 78. The outlet side of this fan connectsthrough a conduit 80 with the two laterally spaced conduits 52 onopposite sides of the burners. Since it may be desirable to vent some ofthe spent gases to the atmosphere there may be provided at any suitablepoint in the circuit a damper controlled opening 82 shown as opening offthe conduit 80.

The operation of the oven may be. briefly described as follows: The hotproducts of combustion from the burners 58 tendto flow upwardly into theflow channels 30 provided around the oven due to the suction of the fan78. The spent heating gases which are withdrawn from the top of the ovenand returned to the conduits 52 by the fan pass through the openingsprovided in the sides of the conduits 52 in an upwardly direction andmingle with the fresh hot combustion gases thereby tempering them. Atempered gaseous mixture therefore flows around the oven to heat theinterior thereof. By regulating the dampers the volume of gases passingthrough any given compartment can be regulated at will and consequentlythe desired distribution of heat within the oven readily obtained.

Although I have shown an operative device still it will be obvious thatmany changes may be made in the size, shape or arrangement of partswithout departing materially from the spirit of the invention. I

What is claimed is:

1. In combination, inner and outer casings forming between them a spacewherethrough combustion gases may pass for heating the inner casing, thebottom wall of the outer casing having a longitudinally extendingopening, a depending channel forming a continuation of said opening, aseries of burners dis-' charging into said channel, and means forwithdrawing combustion gases from the top of said space and deliveringthem into said channel at the sides thereof for heating by the gases ofcombustion formed by said burners.

2. In combination, inner and outer casings forming between them a spacewherethrough combustion gases may pass for heating the inner casing, thebottom wall of the outer casing having a longitudinally extendingopening through which said gases may enter said space, a series ofburnersbelow said opening, side walls forming a narrow upwardly flaringthroat for directing combustion gases from said burners into saidopenmg, a conduit extending alongside said burners and perforated todischarge upwardly into said throat and opening, and means fordelivering spent combustion gases from the top of said space into saidconduit.

3. In combination, heat conduotant walls completely enclosing a shallow,wide and long heating chamber, an outer casing surrounding the chamberin close uniformly spaced relation therewith, and having a narrowlongitudinally extending opening in'its bottom wall and another openinin its top wall, a number of baflles locate Vat spaced intervalsthroughout the length of said chamber, each baflle extendingperipherally around the chamber walls and forming with said walls andouter casing a plurality of \pairs of oppositely disposed heating fluesextending from the bottom opening around opposite sides of the heatingchamber to thetop' opening in the outer casing, dampers for controllingflow of gas through each of said flues. a spent gas-collecting fluearranged to receive gases discharged from said heating flues, dependingaprons and baflles beneath said casing forming a burner housing with anupwardly flaring throat coextensive with said bottom opening fordirecting hot burner gases upwardly into said heating flues, a conduitextending to a point adjacent said burner housing and having outletports adapted to discharge upwardly into said throat and bottom opening,and means for withdrawing spent gases \from said collecting flue anddelivering them through said housing and outlet ports into said throatfor mixing and recirculation with hot burner gases.

4. In an oven, the combination with-a longitudinally extending metalchamber forming the oven chamber proper, of a series oi V partitionssecured to and extending around the outside of said chamber transverselyof the longitudinal axis thereof, oppositely extending casingstelescoped over the opposite sides of said chamber and supported by saidpartitions in spaced relation with respect to the walls of said chamber,an inverted U- shape conduit bridgmg the space between the upperadjacent ends of said casings, mdiidually regulable dampers, forcontrolling the flow of gases in the passages between said partitions, aconduit bridging the space between the lower adjacent ends of saidcasing, and means for delivering hot gases into the last-mentionedconduit for flow between said partitions. t

In testim' on whereof I aflix mk' E NEST G. I): O0

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